.w1200 {
  width: 1200px;
  margin: 0 auto;
}
.clear{
  zoom:1;
}
.fl {
  float: left;
}
.fr{
  float:right;
}
.cl {
  clear: both;
}
.clearfix:after {
  display: block;
  clear: both;
  content:'';
  visibility: hidden;
  height: 0;
}

.clearfix {
  zoom: 1;
}